<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <script src="./lib/moment.2.24.0.js"></script>
    <script src="./lib/vue2.4.4.js"></script>
    <!-- `vue-resource` 依赖于 `vue` -->
    <script src="./lib/vue-resource1.3.4.js"></script>
    <style>
        .ball {
            width: 15px;
            height: 15px;
            border-radius: 50%;
            background-color: mediumorchid;
        }
    </style>
</head>

<body>
    <div id="app">
        <input type="button" value="加入购物车" @click="flag=!flag">
        <transition
            @before-enter="beforeEnter"
            @enter="enter"
            @after-enter="afterEnter"
        >
            <div class="ball" v-show="flag"></div>
        </transition>
    </div>

    <script>
        var FORMAT_TIME_STR = 'YYYY-MM-DD HH:mm:ss';
        var vm = new Vue({
            el: '#app',
            data: {
                flag: false
            },
            methods: {
                beforeEnter(el){
                    el.style.transform = "translate(0, 0)";
                },
                enter(el, done){
                    el.offsetWidth;
                    el.style.transform = "translate(150px, 450px)";
                    el.style.transition = 'all 0.7s ease';

                    done();
                },
                afterEnter(el){
                    this.flag = !this.flag;
                }
            }
        });
    </script>
</body>

</html>